I have two smoke alarms in my flat. Recently I had to change the battery for one of them, so I switched off the mains, disconnected the alarm, replaced the battery, tested it, and reconnected the alarm. However, upon switching the mains back on, both alarms started beeping.
Even if I physically remove either one of the alarms, the other will beep. I'm aware that smoke alarms are daisy chained so that when one alarm is activated all the other alarms will sound an alert, but if one is removed from the system, does that normally automatically activate the remaining ones?
Also, both work normally when I push their test buttons. Anyone have any idea what's happening/how to fix it?